EN 50104:2002

SLOVENSKI STANDARD
01-september-2002
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SIST EN 50104:2000
(OHNWULþQHQDSUDYH]DRGNULYDQMHLQPHUMHQMHNLVLND=DKWHYH]DGHORYDQMHLQ
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Electrical apparatus for the detection and measurement of oxygen - Performance
requirements and test methods
Elektrische Geräte für die Detektion und Messung von Sauerstoff - Anforderungen an
das Betriebsverhalten und Prüfverfahren
Appareils électriques de détection et de mesure de l'oxygène - Règles de performance et
méthodes d'essai
Ta slovenski standard je istoveten z: EN 50104:2002
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50104
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2002
ICS 19.080 Supersedes EN 50104:1998
English version
Electrical apparatus for the detection and measurement of oxygen -
Performance requirements and test methods
Appareils électriques de détection Elektrische Geräte für die Detektion
et de mesure de l'oxygène - und Messung von Sauerstoff -
Règles de performance Anforderungen an das Betriebsverhalten
et méthodes d'essai und Prüfverfahren
This European Standard was approved by CENELEC on 2002-02-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any
other language made by translation under the responsibility of a CENELEC member into its own
language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50104:2002 E
Fore word
This third edition of the European Standard was prepared by SC 31-9, Electrical apparatus for the
detection and measurement of combustible gases to be used in industrial and commercial potentially
explosive atmospheres, of Technical Committee CENELEC TC 31, Electrical apparatus for explosive
atmospheres, on the basis of EN 50104:1998.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50104 on
2002-02-01.
This European Standard supersedes EN 50104:1998.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-02-01
Annexes designated „informative“ are given for information only.
In this standard, Annexes A and B are informative.
_________
– 3 – EN 50104:2002
Contents
Page
1 Scope .5
2 Normative references.5
3 Definitions.6
3.1 Gas properties.6
3.2 Types of instruments .6
3.3 Sensors .7
3.4 Supply of gas to instrument .8
3.5 Signals and alarms .8
3.6 Times .8
4 General requirements.9
4.1 Introduction.9
4.2 Construction.9
4.2.1 General.9
4.2.2 Indicating devices.9
4.2.3 Alarm or output functions . 10
4.2.4 Fault signal . 10
4.2.5 Adjustments . 10
4.2.6 Battery-powered apparatus. 10
4.2.7 Software-controlled apparatus . 10
5 Test methods. 10
5.1 Introduction. 10
5.2 General requirements for tests . 11
5.2.1 Samples and sequence of tests . 11
5.2.2 Preparation of apparatus before testing. 11
5.2.3 Mask for calibration and test. 12
5.3 Normal conditions for test . 12
5.3.1 General. 12
5.3.2 Test gas(es) . 12
5.3.3 Flow rate for test gases. 12
5.3.4 Voltage . 12
5.3.5 Ambient temperature . 12
5.3.6 Pressure . 13
5.3.7 Humidity . 13
5.3.8 Stabilisation time. 13
5.3.9 Orientation. 13
5.4 Test methods and performance requirements . 13
5.4.1 General. 13
5.4.2 Unpowered storage of the apparatus . 13
5.4.3 Calibration, adjustment and repeatability. 13
5.4.4 Drift (continuous duty apparatus only) . 14
5.4.5 Stability (spot-reading apparatus only) . 15
5.4.6 Alarm set point(s) . 15
5.4.7 Temperature . 16
5.4.8 Pressure . 16

5.4.9 Humidity . 17
5.4.10 Air velocity. 17
5.4.11 Flow rate. 17
5.4.12 Orientation. 18
5.4.13 Vibration . 18
5.4.14 Drop test. 19
5.4.15 Warm-up time (not applicable to spot-reading apparatus) . 19
5.4.16 Time of response. 20
5.4.17 Minimum time to operate (spot-reading apparatus). 20
5.4.18 Battery capacity. 20
5.4.19 Power supply variations . 21
5.4.20 Electromagnetic compatibility . 21
5.4.21 Addition of sampling probe. 22
5.4.22 Dust (for apparatus where the atmosphere is sampled by diffusion
only) . 22
5.4.23 Poisons and other gases . 22
5.4.24 Field verification kit . 22
6 Information for use. 23
6.1 Labelling and marking. 23
6.2 Instruction manual . 23
Annex A (informative) Sequence of tests . 26
Annex B (informative) Bibliography . 27

– 5 – EN 50104:2002
1 Scope
This European Standard specifies test methods and performance requirements for portable,
transportable and fixed electrical apparatus for the measurement of the oxygen concentration in gas
mixtures indicating up to 25 % (v/v).
In the case of inert gas purging (inertization), it applies also to apparatus with an oxygen measuring

function for explosion protection.
NOTE The most commonly used oxygen sensors in commercial equipment for industrial application are:
a) paramagnetic sensors;
b) electrochemical sensors (aqueous and solid electrolytes).
This European Standard is applicable to oxygen alarm apparatus intended to measure reliably the
oxygen concentration, to provide an indication, alarm or other output function, the purpose of which is to
give a warning of a potential hazard and, in some cases, to initiate automatic or manual protective
action(s), whenever the level exceeds or falls below a preselected alarm concentration.
It is applicable to apparatus, including integral sampling systems of aspirated apparatus, intended to be
used for commercial and industrial safety applications.
It does not apply to external sampling systems, or to apparatus of laboratory or scientific type, or to
medical equipment, or to apparatus used only for process control purposes.
2 Normative references
This European Standard incorporates by dated or undated references, provisions from other publications.
These normative references are cited at the appropriate place in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this European Standard only when incorporated in it by amendment or revision. For undated
references the latest edition of the publication referred to applies.
EN 50270 1999 Electromagnetic compatibility - Electrical apparatus for the detection and
measurement of combustible gases, toxic gases or oxygen
EN 50271 2001 Electrical apparatus for the detection and measurement of combustible
gases, toxic gases or oxygen - Requirements and tests for apparatus using
software and/or digital technologies
EN 60068-2-6 1995 Environmental testing - Part 2: Tests - Test Fc: Vibration (sinusoidal)
(IEC 60068-2-6:1995 + corrigendum March 1995)

3 Definitions
For the purposes of this standard, the following definitions apply.
3.1 Gas properties
3.1.1
ambient air
normal atmosphere surrounding the apparatus
3.1.2
poisons (of sensors)
substances which lead to temporary or permanent loss of sensitivity of the sensors
3.1.3
reference air
air, under normal ambient conditions, with an oxygen concentration of (21 � 0,4) % (v/v)
3.1.4
standard test gas
test gas with a composition specified for each apparatus to be used for all tests unless otherwise stated
(see 5.3.2)
3.1.5
volume ratio (v/v)
ratio of the volume of a component gas to the volume of the gas mixture under specified conditions of
temperature and pressure
3.1.6
zero test gas
gas, such as nitrogen, which is free of oxygen, and interfering and contaminating substances
3.2 Types of instruments
3.2.1
alarm-only apparatus
apparatus having an alarm but not having a meter or other indicating device that would allow
measurement of the deviations permitted by the requirements of the appropriate chapters of this
European Standard
3.2.2
aspirated apparatus
apparatus that obtains the gas by drawing it to the gas sensor, for example, by means of a hand-
operated or electric pump
3.2.3
continuous-duty apparatus
apparatus that is
...